U-Line Ice Maker Error Code L Zone T Short

This error means the left zone thermistor circuit has shorted, producing a near-zero resistance reading that the control board cannot use for temperature monitoring. The thermistor is the sensor that tracks temperatures in the left compartment of the unit. The fault can originate from a damaged cable, a failed sensor, or moisture in the wiring. The ice maker will not operate normally until the short is identified and corrected.

It is not recommended to continue running the unit while this error is active. Without accurate temperature data from the left zone thermistor, the control board cannot properly regulate cooling or ice production cycles, which could result in unsafe food or ice storage temperatures. Address the fault before returning the unit to normal use.

A reset may temporarily clear the error code, but if the underlying short in the thermistor circuit has not been repaired, the fault will return once the control board runs its diagnostics again. Resetting should only be done after inspecting and correcting the wiring or replacing the faulty component to confirm the repair was successful.

A knowledgeable DIYer can begin by inspecting the thermistor cable for pinch points, damaged insulation, or moisture. If the cable is visibly damaged, replacing it is a straightforward repair. However, if the short is internal to the thermistor or involves the control board, testing with a multimeter and sourcing the correct replacement part may be necessary, which can require more technical experience.

If only the thermistor or its cable needs replacement, parts costs are generally modest, typically in the range of $15 to $60 depending on the component. If a service technician is needed, labor charges will add to that cost, often bringing the total to a range of $100 to $250. Control board replacement, if required, will be significantly more expensive.